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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
Originally Posted by luv2runn. I developed iron deficiency anemia a few years ago and my fingernails would often look bluish/purple. However, right now I seem to have a normal amount of energy. I read on the internet that your nails look clear in color when you have anemia, so I am confused.